A pickup truck's weight depends on the model, make and size of the truck. Normally, a pickup truck would weigh from 1750 lbs to 4550 lbs, but even that is just a guess since the exact numbers vary from one truck to the next. A pickup truck's weight depends on the model, make and size of the truck.
rods and cones. The photoreceptor cells of the retina. They are between the pigment epithelium and the bipolar layer of neurons. The rods contain rhodopsin, which is stimulated by light; the cones contain one of three other photopigments, which are stimulated by various wavelengths of visible light (colors).
The human eye contains two kinds of photoreceptor cells; rods and cones. Roughly 125 million of them are intermingled nonuniformly over the retina.(Hecht) The ensemble of rods(each about 0.002 mm in diameter) forms an exceedingly sensitive detector, performing in light too dim for the cones to respond to.